IBASE Technology ET976, Design Manual

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COM Express® Carrier Board Design Guide iii
Table of Contents
Chapter 1 General Information ................................................................. 1
1.1 ABOUT COM EXPRESS ........................................................................... 1
Chapter 2 COM Express Interfaces ............................................................... 2
2.1 General Purpose PCIe Lanes .................................................................... 3
2.1.1 Device Up / Device Down and PCIe Rx / Tx Coupling Capacitors ......... 3
2.1.2 Schematic Examples .............................................................................. 4
2.1.3 PCI Express Routing Considerations ..................................................... 7
2.2 PEG (PCI Express Graphics) ..................................................................... 8
2.2.1 Reference Schematics ......................................................................... 10
2.3 Digital Display Interfaces ......................................................................... 11
2.3.1 DisplayPort / HDMI / DVI .................................................................... 11
2.3.1.1 Reference Schematic ......................................................................... 12
2.3.1.2 Routing Considerations ...................................................................... 17
2.3.2 SDVO ................................................................................................. 18
2.3.2.1 Signal Definitions ............................................................................... 18
2.3.2.2 Reference Schematics ....................................................................... 18
2.3.2.3 Routing Considerations ...................................................................... 18
2.4 LAN .......................................................................................................... 19
2.4.1 Signal Definitions ............................................................................... 19
2.4.2 Reference Schematics ....................................................................... 20
2.4.3 Routing Considerations ...................................................................... 20
2.5 USB Ports ................................................................................................ 21
2.5.1 Signal Definitions ............................................................................... 21
2.5.2 Reference Schematics ....................................................................... 22
2.5.3 Routing Considerations ...................................................................... 22
2.6 USB 3.0 .................................................................................................... 23
2.6.1 Signal Definitions ............................................................................... 23
2.6.2 Reference Schematics ....................................................................... 24
2.6.3 Routing Considerations ...................................................................... 26
2.7 SATA ........................................................................................................ 27
2.7.1 Signal Definitions ............................................................................... 27
2.7.2 Reference Schematic ......................................................................... 28
2.7.3 Routing Considerations ...................................................................... 28